降雨诱发泥石流演化及土壤颗粒运移特性研究  

Research on Rainfall-induced Debris Flows and Soil Particle Movement

作　　者：赵吉坤[1,2] 黄书君[1] 王丹[1] 张大鸣 朱小春 

机构地区：[1]南京农业大学工学院,江苏南京210031 [2]江苏省智能化农业装备重点实验室,江苏南京210031 [3]美国加州州立大学,弗雷斯诺93740 [4]中国水利电力对外公司,北京100011

出　　处：《土壤通报》2015年第5期1089-1095,共7页Chinese Journal of Soil Science

基　　金：江苏省农机基金项目(GXZ14003);江苏省自然科学基金项目(BK2010457);国家自然科学基金资助项目(51275250)资助

摘　　要：基于离散单元法DEM,推导颗粒连接-损伤断裂-运动演化本构模型,建立岩体崩塌边坡模型,进行降雨诱发岩体崩塌滑动及泥石流演化动态过程模拟,在二维边坡模型中实时跟踪6个监测点相关力学及运动参数,分析从稳定至滑动,再到泥石流运动演化过程中参数变化情况,结果表明:细观颗粒间从黏结到损伤断裂再到运动过程中,非线性运动特征差异化明显。基于格陵兰岛岩体崩塌地质条件,建立三维DEM模型,研究了不同基岩坡度下的泥石流演化及土壤颗粒的非线性运动特征;结果表明:基岩坡度从1.0到2.0阶段,测点位移及速度与坡度基本成线性关系,而坡度2.0以上非线性特性显著。Based on the discrete element method, the research deduced the constitutive model of particles bond-damage fracture-move. A two-dimensional slope model of rock mass collapse was established to simulate the rainfall-induced debris flows and soil particle movement. The changes of mechanics parameters of six monitoring points were tracked and analyzed. Results showed that, nonlinear motion of microscopic particles was obvious during the process of bond-damage fracture-move. Based on the geological conditions of rock mass collapse and debris flow in Greenland of Denmark, a three-dimensional slope model was established. Results showed displacements and velocities of measuring points both displayed linear relationship with slope when slope increased from 1.0 to 2.0; while non-linear capacity was strong under the slope with a degree above 2.0.

关 键 词：岩体崩塌 细观破坏 泥石流 土壤颗粒 数值模拟 

分 类 号：P642.23[天文地球—工程地质学] TU43[天文地球—地质矿产勘探]